là 12 đó

k nha

chúc bạn học giỏi

theo mình là 174/7 

k mình nha

Theo đb ta đc:

y+y*1/3+2/7=58

y*(1+1/3)=58-2/7

y*4/3=404/7

y=404/7:4/3

y=303/7

đéch hiểu

để mk dịch trước cho các bạn làm cho dễ nha, hơi hại não tí

tìm y

y + y x 1/3 : 2/9 + y : 2/7 = 252

là vậy đúng ko

y + y x 1/3 : 2/9 + y : 2/7 = 252

y x 1 + y x 1/3 : 2/9 + y : 2/7 = 252

y x 1 + y x 1/3 x 9/2 + y x 7/2 = 252

y x ( 1 + 1/3 + 7/2 ) x 9/2 = 252

y x ( 1 + 1/3 + 7/2 )         = 252 : 9/2

y x ( 1 + 1/3 + 7/2 )         = 9/504

y x        26/6                   = 9/504

y                                    = 9/504 : 26/6

y                                    = 3/728

hỏi google phay

Hỏi gg đi khó lắm

Xin lỗi  vì ko giúp cho bạn vì khó lắm

6/13:1/(2+y) =15/39

<=> (12+6y)/13=15/39

<=> 468+234y=195

<=>234y=-273

<=> y=-7/6

6/13+ -14/39=

\(\frac{6}{13}\div\left(\frac{1}{2}+y\right)=\frac{15}{39}\)

\(\frac{1}{2}+y=\frac{6}{13}\div\frac{15}{39}\)

\(\frac{1}{2}+y=\frac{6}{5}\)

\(y=\frac{6}{5}-\frac{1}{2}\)

\(y=\frac{7}{10}\).

~ Chúc bạn hok tốt ~

\(\left(5-\frac{23}{7}\right)×\frac{63}{24}+\frac{11}{9}:\frac{2}{3}\)

\(=\frac{12}{7}×\frac{63}{24}+\frac{11}{9}:\frac{2}{3}\)

\(=\frac{9}{2}+\frac{11}{9}:\frac{2}{3}\)

\(=\frac{9}{2}+\frac{11}{6}\)

\(=\frac{19}{3}\)

Bằng 19/3 nha

    chúc bn hok tốt

\(\left(5-\frac{23}{7}\right)\times\frac{63}{24}+\frac{11}{9}:\frac{2}{3}\)

\(=\frac{12}{7}\times\frac{63}{24}+\frac{11}{6}\)

\(=\frac{9}{2}+\frac{11}{6}\)

\(=\frac{19}{3}\)

Học tốt

\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)

\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)

\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)

\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)

a. \(\frac{3}{4}+\frac{5}{9}\div\frac{4}{5}=\frac{3}{4}+\frac{25}{36}=\frac{13}{9}.\)

b. \(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)

a)\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}x\)\(\frac{5}{4}=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{52}{36}=\frac{13}{9}\)